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After a lot of digging, it seems that the oddly named hw->ps member is all about setting the core into reverse SGMII speed. When set to a non-zero value, it: 1. Configures the MAC at initialisation time to operate at a specific speed. 2. It _incorrectly_ enables the transmitter (GMAC_CONFIG_TE) which makes no sense, rather than enabling the "transmit configuration" bit (GMAC_CONFIG_TC). 3. It configures the SGMII rate adapter layer to retrieve its speed setting from the MAC configuration register rather than the PHY. In the previous commit, we removed (1) and (2) as phylink overwrites the configuration set at that step. Thus, the only functional aspect is (3), which is a boolean operation. This means there is no need to store the actual speed, and just have a boolean flag. Convert the priv->ps member to a boolean, and rename it to priv->reverse_sgmii_enable to make it more understandable. Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> Tested-by: Maxime Chevallier <maxime.chevallier@bootlin.com> Tested-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> Link: https://patch.msgid.link/E1v9P6i-0000000Aom3-1y2y@rmk-PC.armlinux.org.uk Signed-off-by: Jakub Kicinski <kuba@kernel.org> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.